Update for artifacts_handler

* Added a new example for artifacts_handler

Fixes: #739

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

docs/python_interface.rst

@@ -218,6 +218,18 @@ Usage examples
   print(r.stats)
 
 
+.. code-block:: python
+
+  import ansible_runner
+
+  def my_artifacts_handler(artifacts_dir):
+      # Do something here
+      print(artifacts_dir)
+
+  # Do something with artifact directory after the run is complete
+  r = ansible_runner.run(private_data_dir='/tmp/demo', playbook='test.yml', artifacts_handler=my_artifacts_handler)
+
+
 .. code-block:: python
 
   import ansible_runner